The measurement of the electric current with an optical fiber sensor can be made insensitive to external vibrations that act on the leading fiber by using a circuit involving a mirrored Faraday rotator and a highly twisted low-birefringence fiber. A description of the optical configuration as well as our first experimental results are presented. The circuit gives a passive compensation of the disturbances with a measured rejection of the order of 30 dB while maintaining the correct sensitivity to the measurement of the Faraday effect.
© 1993 Optical Society of America
Natale C. Pistoni and Mario Martinelli, "Vibration-insensitive fiber-optic current sensor," Opt. Lett. 18, 314-316 (1993)